NoClassDefFoundError

[RoyT]

Hi, I cannot understand why I get the above error when running my java app under Apache Tomcat, when the compile picks up the class ok. The class in question is FloatDimension.
I have set up my classpath to include jcommon-0.9.7.jar, and I have code containing
import org.jfree.ui.FloatDimension;

and
factory.setMinimumSize(new FloatDimension(150, 20));

The class is obviously picked up at compile, but then falls over when initialising the class containing the above code.

Any ideas please?

[djr10007a]

Just curious, did you solve this yet?

I am having a similar problem using Eclipse. Under the IDE, my application runs fine, but when I export it to an executable JAR, I get the NoClassDefFound error like you.

I wish to generate a single executable jar containing the jfreechart classes, but can't seem to get it to happen!

[RoyT]

Hi

My problem was caused by Apache Tomcat not using the classpath. When I put the jar file into the lib directory then it all worked.

Best of luck with your problem.

RoyT

[cassidyh]

I am having the same problem with running my app from Eclipse is fine, but when I create a jar, nothing happens. SOmebody please help

[RoyT]

Hi cassidyh.

I am sorry but I do not know anything about Eclipse or how it sets its classpath or where appropriate files should be stored.

RoyT

[Mimil]

Hi,

Tell us a bite more about how you are doing perhaps it will be easier.
But jars need classes to be also in the path, so did you do this properly?

[cassidyh]

I actually had to extract all source files from Jcommon.jar as well as from jfreechart.jar and add it to my project before I packed it into a self-executable jar file. That is the only way to make the code portable. It is also ridiculous...I mean, what's the point of using a jar file for classes, if the jar utility won't pack the jar files with it. And yes, I did have all necessary jar files on my build path. Now, I can transport my code into a self-executable, but I am not very happy about having to add all the source and class files to my jar instead of just the jar files. Maybe this is an Eclipse bug.....don't know
cass

[Mimil]

Hi,

As for me, and my understanding of java, you will have to carry all the jars. You can't include jars in an other jar. But you can set a classpath attribut in your manifest to tell where are located the other jars (and it can be relative).

[cassidyh]

HOw do write that into the manifest file? I am not so sure about how to do it, but that would be great. I appreciate any help, because my way works, but it is by far not very effective at all.

[Mimil]

Hi,

here is an exemple of one auto generated by ant:

Code: Select all

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.6.2
Created-By: 1.2.2 (Sun Microsystems Inc.)
Class-Path: lib/jcommon-1.0.0-rc1.jar lib/pixie-0.8.4.jar

Here is the reference doc : http://java.sun.com/j2se/1.4.2/docs/guide/jar/jar.html

[Vincent643]

You can't include jars in an other jar.

Thank you Mimil for this! Thanks a lot, that is exaclty what I was looking for.

Vincent

[Taqua]

Well,

actually, there is a way to create such jars. It involves writing an own Classloader that accesses the jars stored inside. That's the deepest black magic possibly imaginable. But as usual: Someone already did it.

http://classworlds.codehaus.org/uberjar.html

Regards,
Thomas